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SOCKS4 is not supported on any paid product. If you are seeing SOCKS4 connection errors, this is expected — only our free proxy list includes SOCKS4. All paid proxy types (Premium, Dedicated, Residential, and ISP) support SOCKS5 only, alongside HTTP.
The datacenter, residential, ISP, and free proxy options support the following protocols.

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Premium proxies

The premium proxies support:
  • HTTP
  • Socks5 (TCP & UDP)

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Dedicated proxies

The dedicated proxies support:
  • HTTP
  • Socks5 (TCP)
Note: Socks5 is the only Socks protocol we support for datacenter proxies. Both premium proxies and dedicated proxies are suitable for high-bandwidth activities.

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Residential proxies

  • HTTP
  • Socks5 (TCP only)

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ISP proxies

The ISP proxies support:
  • HTTP
  • Socks5 (TCP & UDP)

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Free proxies

Our free proxy list includes:
  • HTTP
  • Socks4
  • Socks5

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Choosing HTTP vs. Socks5

If you selected HTTP when purchasing but are connecting on a Socks5 port (or vice versa), your connection will fail or time out. Double-check that the protocol in your client/tool matches the protocol of the host:port you were given — the port number is tied to a specific protocol and cannot be reused for the other protocol.

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Ports are fixed

The port assigned to your proxy is fixed and should not be manually changed (for example, swapping port 1080 for 1081). Using an unassigned or incorrect port can cause instability or unexpected bandwidth usage. See What ports do the proxies use? for the full list of supported ports. If your proxies still aren’t connecting after confirming the protocol and port, see Why are proxies not working?.